A surge in fossil fuel prices since the Iran war is squeezing polyester suppliers and garment makers across India and Bangladesh, threatening to raise costs for fast-fashion retailers like Zara and H&M. Filatex, one of India’s biggest polyester yarn producers, is paying nearly 30% more for the petroleum-derived feedstocks - purified terephthalic acid (PTA) and monoethylene glycol (MEG) - that